/**
 * libpsd - Photoshop file formats (*.psd) decode library
 * Copyright (C) 2004-2007 Graphest Software.
 *
 * libpsd is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: blend.c, created by Patrick in 2005.06.01, libpsd@graphest.com Exp $
 */

#include <stdlib.h>
#include <math.h>
#include "libpsd.h"
#include "psd_config.h"
#include "psd_system.h"
#include "psd_color.h"
#include "psd_rect.h"
#include "psd_blend.h"
#include "psd_math.h"


extern psd_bool psd_adjustment_layer_blend(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect);
extern psd_bool psd_layer_effects_blend_background(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect);
extern psd_bool psd_layer_effects_blend_foreground(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect);


#ifdef PSD_SUPPORT_LAYER_BLEND

psd_static psd_status psd_build_rand_data(psd_context * context)
{
    psd_int i;
    psd_uchar * rand_data;

    context->rand_data = (psd_uchar *)psd_malloc(context->width * context->height);
    if(context->rand_data == NULL)
        return psd_status_malloc_failed;

    srand(0);
    rand_data = context->rand_data;
    for(i = context->width * context->height; i --; )
    {
        *rand_data = rand() & 0xFF;
        rand_data ++;
    }

    return psd_status_done;
}

psd_static void psd_image_clear_rect(psd_context * context, psd_rect * dst_rect)
{
    psd_int i, width;
    psd_argb_color * dst_color;

    dst_color = context->blending_image_data + dst_rect->top * context->width + dst_rect->left;
    width = psd_rect_width(dst_rect);
    for(i = dst_rect->top; i < dst_rect->bottom; i ++)
    {
        psd_color_memset(dst_color, psd_color_clear, width);
        dst_color += context->width;
    }
}

psd_bool psd_layer_check_restricted(psd_context * context, psd_layer_record * layer)
{
    psd_int i;

    if(context->color_mode != psd_color_mode_rgb)
        return psd_false;

    if(layer->knockout != 0)
        return psd_true;

    for(i = 0; i < layer->number_of_channels; i ++)
    {
        if(layer->channel_info[i].restricted == psd_true)
            return psd_true;
    }

    if(layer->layer_blending_ranges.gray_black_src != 0 ||
        layer->layer_blending_ranges.gray_white_src != 65535 ||
        layer->layer_blending_ranges.gray_black_dst != 0 ||
        layer->layer_blending_ranges.gray_white_dst != 65535)
        return psd_true;

    for(i = 0; i < layer->layer_blending_ranges.number_of_blending_channels; i ++)
    {
        if(layer->layer_blending_ranges.channel_black_src[i] != 0 ||
            layer->layer_blending_ranges.channel_white_src[i] != 65535 ||
            layer->layer_blending_ranges.channel_black_dst[i] != 0 ||
            layer->layer_blending_ranges.channel_white_dst[i] != 65535)
            return psd_true;
    }
    
    return psd_false;
}

void psd_layer_blend_normal(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
{
    psd_argb_color * dst_data, * src_data, dst_color, src_color;
    psd_int i, j, width, height;
    psd_int opacity, mix_alpha;
    psd_int dst_red, dst_green, dst_blue, dst_alpha, src_alpha;
    psd_color_component * mask_data = NULL, mask_color, default_mask_color;
    psd_int mask_left, mask_right, dst_left;
    psd_layer_mask_info * layer_mask_info = &layer->layer_mask_info;

    width = psd_rect_width(dst_rect);
    height = psd_rect_height(dst_rect);
    opacity = layer->opacity * layer->fill_opacity / 255;
    if(layer->group_layer != NULL)
        opacity = opacity * layer->group_layer->opacity / 255;
    
    if(layer_mask_info->disabled == psd_false)
        default_mask_color = layer_mask_info->default_color;
    else
        default_mask_color = 255;
    mask_left = layer_mask_info->left;
    mask_right = layer_mask_info->right;
    dst_left = dst_rect->left;

    if(opacity == 255)
    {
        for(i = 0; i < height; i ++)
        {
            dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
                dst_rect->left;
            src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
                (dst_rect->left - layer->left);
            
            if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
                i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
            {
                mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                    PSD_MAX(0, dst_rect->left - layer_mask_info->left);
            }
            else
            {
                mask_data = NULL;
            }
            
            for(j = 0; j < width; j ++, dst_data ++, src_data ++)
            {
                src_color = *src_data;
                src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);
                
                if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
                {
                    mask_color = *mask_data;
                    mask_data ++;
                    switch(mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * mask_color >> 8;
                            break;
                    }
                }
                else if(default_mask_color != 255)
                {
                    switch(default_mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * default_mask_color >> 8;
                            break;
                    }
                }
                
                switch(src_alpha)
                {
                    case 0:
                        break;
                    case 255:
                        *dst_data = src_color;
                        break;
                    default:
                        dst_color = *dst_data;
                        dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
                        dst_red = PSD_GET_RED_COMPONENT(dst_color);
                        dst_green = PSD_GET_GREEN_COMPONENT(dst_color);
                        dst_blue = PSD_GET_BLUE_COMPONENT(dst_color);
                        switch(dst_alpha)
                        {
                            case 0:
                                *dst_data = src_color;
                                break;
                            case 255:
                                dst_red = ((dst_red << 8) + (PSD_GET_RED_COMPONENT(src_color) - dst_red) * src_alpha) >> 8;
                                dst_green = ((dst_green << 8) + (PSD_GET_GREEN_COMPONENT(src_color) - dst_green) * src_alpha) >> 8;
                                dst_blue = ((dst_blue << 8) + (PSD_GET_BLUE_COMPONENT(src_color) - dst_blue) * src_alpha) >> 8;
                                *dst_data = PSD_RGB_TO_COLOR(dst_red, dst_green, dst_blue);
                                break;
                            default:
                                mix_alpha = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                                dst_alpha = dst_alpha + ((256 - dst_alpha) * src_alpha >> 8);
                                dst_red = ((dst_red << 8) + (PSD_GET_RED_COMPONENT(src_color) - dst_red) * mix_alpha) >> 8;
                                dst_green = ((dst_green << 8) + (PSD_GET_GREEN_COMPONENT(src_color) - dst_green) * mix_alpha) >> 8;
                                dst_blue = ((dst_blue << 8) + (PSD_GET_BLUE_COMPONENT(src_color) - dst_blue) * mix_alpha) >> 8;
                                *dst_data = PSD_ARGB_TO_COLOR(dst_alpha, dst_red, dst_green, dst_blue);
                                break;
                        }
                        break;
                }
            }
        }
    }
    else
    {
        for(i = 0; i < height; i ++)
        {
            dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
                dst_rect->left;
            src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
                (dst_rect->left - layer->left);
            
            if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
                i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
            {
                mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                    PSD_MAX(0, dst_rect->left - layer_mask_info->left);
            }
            else
            {
                mask_data = NULL;
            }
            
            for(j = 0; j < width; j ++, dst_data ++, src_data ++)
            {
                src_color = *src_data;
                src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);
                
                if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
                {
                    mask_color = *mask_data;
                    mask_data ++;
                    switch(mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * mask_color >> 8;
                            break;
                    }
                }
                else if(default_mask_color != 255)
                {
                    switch(default_mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * default_mask_color >> 8;
                            break;
                    }
                }
                
                switch(src_alpha)
                {
                    case 0:
                        break;
                    default:
                        src_alpha = src_alpha * opacity >> 8;
                        dst_color = *dst_data;
                        dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
                        dst_red = PSD_GET_RED_COMPONENT(dst_color);
                        dst_green = PSD_GET_GREEN_COMPONENT(dst_color);
                        dst_blue = PSD_GET_BLUE_COMPONENT(dst_color);
                        switch(dst_alpha)
                        {
                            case 0:
                                *dst_data = (src_alpha << 24) | (src_color & 0x00FFFFFF);
                                break;
                            case 255:
                                dst_red = ((dst_red << 8) + (PSD_GET_RED_COMPONENT(src_color) - dst_red) * src_alpha) >> 8;
                                dst_green = ((dst_green << 8) + (PSD_GET_GREEN_COMPONENT(src_color) - dst_green) * src_alpha) >> 8;
                                dst_blue = ((dst_blue << 8) + (PSD_GET_BLUE_COMPONENT(src_color) - dst_blue) * src_alpha) >> 8;
                                *dst_data = PSD_RGB_TO_COLOR(dst_red, dst_green, dst_blue);
                                break;
                            default:
                                mix_alpha = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                                dst_alpha = dst_alpha + ((256 - dst_alpha) * src_alpha >> 8);
                                dst_red = ((dst_red << 8) + (PSD_GET_RED_COMPONENT(src_color) - dst_red) * mix_alpha) >> 8;
                                dst_green = ((dst_green << 8) + (PSD_GET_GREEN_COMPONENT(src_color) - dst_green) * mix_alpha) >> 8;
                                dst_blue = ((dst_blue << 8) + (PSD_GET_BLUE_COMPONENT(src_color) - dst_blue) * mix_alpha) >> 8;
                                *dst_data = PSD_ARGB_TO_COLOR(dst_alpha, dst_red, dst_green, dst_blue);
                                break;
                        }
                        break;
                }
            }
        }
    }
}

void psd_layer_blend(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
{
    psd_argb_color * dst_data, * src_data, dst_color, src_color;
    psd_int i, j, width, height;
    psd_int opacity, mix_alpha;
    psd_int dst_red, dst_green, dst_blue, dst_alpha, src_red, src_green, src_blue, src_alpha;
    psd_int dst_hue, dst_saturation, dst_brightness, src_hue, src_saturation, src_brightness;
    psd_blend_mode blend_mode;
    psd_color_component * mask_data = NULL, mask_color, default_mask_color;
    psd_int mask_left, mask_right, dst_left;
    psd_layer_mask_info * layer_mask_info = &layer->layer_mask_info;
    psd_uchar * rand_data;

    width = psd_rect_width(dst_rect);
    height = psd_rect_height(dst_rect);
    opacity = layer->opacity * layer->fill_opacity / 255;
    if(layer->group_layer != NULL)
        opacity = opacity * layer->group_layer->opacity / 255;
    if(layer->group_layer != NULL && layer->group_layer->divider_blend_mode != psd_blend_mode_pass_through)
        blend_mode = layer->group_layer->divider_blend_mode;
    else
        blend_mode = layer->blend_mode;

    if(layer_mask_info->disabled == psd_false)
        default_mask_color = layer_mask_info->default_color;
    else
        default_mask_color = 255;
    mask_left = layer_mask_info->left;
    mask_right = layer_mask_info->right;
    dst_left = dst_rect->left;
    
    if(blend_mode == psd_blend_mode_dissolve)
    {
        for(i = 0; i < height; i ++)
        {
            dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
                dst_rect->left;
            src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
                (dst_rect->left - layer->left);
            rand_data = context->rand_data + (i + dst_rect->top) * context->width + dst_rect->left;
            
            if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
                i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
            {
                mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                    PSD_MAX(0, dst_rect->left - layer_mask_info->left);
            }
            else
            {
                mask_data = NULL;
            }

            for(j = 0; j < width; j ++, dst_data ++, src_data ++, rand_data ++)
            {
                src_color = *src_data;
                src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);
                
                if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
                {
                    mask_color = *mask_data;
                    mask_data ++;
                    switch(mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * mask_color >> 8;
                            break;
                    }
                }
                else if(default_mask_color != 255)
                {
                    switch(default_mask_color)
                    {
                        case 0:
                            continue;
                        case 255:
                            break;
                        default:
                            src_alpha = src_alpha * default_mask_color >> 8;
                            break;
                    }
                }

                switch(src_alpha)
                {
                    case 0:
                        break;
                    case 255:
                        *dst_data = (src_color & 0x00FFFFFF) | 0xFF000000;
                        break;
                    default:
                        dst_alpha = PSD_GET_ALPHA_COMPONENT(*dst_data);
                        mix_alpha = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                        if(*rand_data <= mix_alpha)
                            *dst_data = (src_color & 0x00FFFFFF) | 0xFF000000;
                        break;
                }
            }
        }

        return;
    }

    for(i = 0; i < height; i ++)
    {
        dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
            dst_rect->left;
        src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
            (dst_rect->left - layer->left);
        
        if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
            i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
        {
            mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                PSD_MAX(0, dst_rect->left - layer_mask_info->left);
        }
        else
        {
            mask_data = NULL;
        }

        for(j = 0; j < width; j ++, dst_data ++, src_data ++)
        {
            src_color = *src_data;
            src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);
            
            if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
            {
                mask_color = *mask_data;
                mask_data ++;
                switch(mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * mask_color >> 8;
                        break;
                }
            }
            else if(default_mask_color != 255)
            {
                switch(default_mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * default_mask_color >> 8;
                        break;
                }
            }
            
            switch(src_alpha)
            {
                case 0:
                    continue;
                default:
                    src_alpha = src_alpha * opacity >> 8;
                    dst_color = *dst_data;
                    dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
                    switch(dst_alpha)
                    {
                        case 0:
                            *dst_data = (src_alpha << 24) | (src_color & 0x00FFFFFF);
                            continue;
                        case 255:
                            mix_alpha = src_alpha;
                            break;
                        default:
                            mix_alpha = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                            dst_alpha = dst_alpha + ((256 - dst_alpha) * src_alpha >> 8);
                            break;
                    }
                    break;
            }
            
            src_red = PSD_GET_RED_COMPONENT(src_color);
            src_green = PSD_GET_GREEN_COMPONENT(src_color);
            src_blue = PSD_GET_BLUE_COMPONENT(src_color);
            dst_red = PSD_GET_RED_COMPONENT(dst_color);
            dst_green = PSD_GET_GREEN_COMPONENT(dst_color);
            dst_blue = PSD_GET_BLUE_COMPONENT(dst_color);

            switch(blend_mode)
            {
                case psd_blend_mode_normal:
                    PSD_BLEND_NORMAL(dst_red, src_red, mix_alpha);
                    PSD_BLEND_NORMAL(dst_green, src_green, mix_alpha);
                    PSD_BLEND_NORMAL(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_darken:
                    PSD_BLEND_DARKEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_DARKEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_DARKEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_multiply:
                    PSD_BLEND_MULTIPLY(dst_red, src_red, mix_alpha);
                    PSD_BLEND_MULTIPLY(dst_green, src_green, mix_alpha);
                    PSD_BLEND_MULTIPLY(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_color_burn:
                    PSD_BLEND_COLOR_BURN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_COLOR_BURN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_COLOR_BURN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_burn:
                    PSD_BLEND_LINEEAR_BURN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEEAR_BURN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEEAR_BURN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_lighten:
                    PSD_BLEND_LIGHTEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LIGHTEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LIGHTEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_screen:
                    PSD_BLEND_SCREEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_SCREEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_SCREEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_color_dodge:
                    PSD_BLEND_COLOR_DODGE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_COLOR_DODGE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_COLOR_DODGE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_dodge:
                    PSD_BLEND_LINEAR_DODGE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEAR_DODGE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEAR_DODGE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_overlay:
                    PSD_BLEND_OVERLAY(dst_red, src_red, mix_alpha);
                    PSD_BLEND_OVERLAY(dst_green, src_green, mix_alpha);
                    PSD_BLEND_OVERLAY(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_soft_light:
                    PSD_BLEND_SOFTLIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_SOFTLIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_SOFTLIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hard_light:
                    PSD_BLEND_HARDLIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_HARDLIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_HARDLIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_vivid_light:    // ?
                    PSD_BLEND_VIVID_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_VIVID_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_VIVID_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_light:    // ?
                    PSD_BLEND_LINEAR_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEAR_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEAR_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_pin_light:
                    PSD_BLEND_PIN_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_PIN_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_PIN_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hard_mix:
                    PSD_BLEND_HARD_MIX(dst_red, src_red, mix_alpha);
                    PSD_BLEND_HARD_MIX(dst_green, src_green, mix_alpha);
                    PSD_BLEND_HARD_MIX(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_difference:
                    PSD_BLEND_DIFFERENCE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_DIFFERENCE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_DIFFERENCE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_exclusion:
                    PSD_BLEND_EXCLUSION(dst_red, src_red, mix_alpha);
                    PSD_BLEND_EXCLUSION(dst_green, src_green, mix_alpha);
                    PSD_BLEND_EXCLUSION(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hue:
                case psd_blend_mode_saturation:
                case psd_blend_mode_color:
                case psd_blend_mode_luminosity:
                    psd_rgb_to_inthsb(src_red, src_green, src_blue, &src_hue, &src_saturation, &src_brightness);
                    psd_rgb_to_inthsb(dst_red, dst_green, dst_blue, &dst_hue, &dst_saturation, &dst_brightness);
                    switch(blend_mode)
                    {
                        case psd_blend_mode_hue:
                            dst_hue = src_hue;
                            break;
                        case psd_blend_mode_saturation:
                            dst_saturation = src_saturation;
                            break;
                        case psd_blend_mode_color:
                            dst_hue = src_hue;
                            dst_saturation = src_saturation;
                            break;
                        case psd_blend_mode_luminosity:
                            dst_brightness = src_brightness;
                            break;
                    }
                    psd_inthsb_to_rgb(dst_hue, dst_saturation, dst_brightness, &src_red, &src_green, &src_blue);
                    dst_red = PSD_BLEND_CHANNEL(dst_red, src_red, mix_alpha);
                    dst_green = PSD_BLEND_CHANNEL(dst_green, src_green, mix_alpha);
                    dst_blue = PSD_BLEND_CHANNEL(dst_blue, src_blue, mix_alpha);
                    break;
            }
            
            *dst_data = PSD_ARGB_TO_COLOR(dst_alpha, dst_red, dst_green, dst_blue);
        }
    }
}

void psd_layer_blend_normal_restricted(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
{
    psd_bool gray_restricted = psd_false, red_restricted = psd_false, green_restricted = psd_false, blue_restricted = psd_false;
    psd_int min_src_gray = 0, max_src_gray = 255, min_src_red = 0, max_src_red = 255, 
        min_src_green = 0, max_src_green = 255, min_src_blue = 0, max_src_blue = 255;
    psd_int min_dst_gray = 0, max_dst_gray = 255, min_dst_red = 0, max_dst_red = 255, 
        min_dst_green = 0, max_dst_green = 255, min_dst_blue = 0, max_dst_blue = 255;
    psd_argb_color * dst_data, * src_data, dst_color, src_color;
    psd_int i, j, width, height;
    psd_int opacity;
    psd_int src_red, src_green, src_blue, src_alpha, 
        dst_red, dst_green, dst_blue, dst_alpha, gray;
    psd_int flr1, flr2;
    psd_color_component * mask_data = NULL, mask_color, default_mask_color;
    psd_int mask_left, mask_right, dst_left;
    psd_layer_mask_info * layer_mask_info = &layer->layer_mask_info;

    for(i = 0; i < layer->number_of_channels; i ++)
    {
        if(layer->channel_info[i].restricted == psd_true)
        {
            switch(layer->channel_info[i].channel_id)
            {
                case 0:
                    red_restricted = psd_true;
                    break;
                case 1:
                    green_restricted = psd_true;
                    break;
                case 2:
                    blue_restricted = psd_true;
                    break;
            }
        }
    }
    if(red_restricted == psd_true && green_restricted == psd_true && blue_restricted == psd_true)
        gray_restricted = psd_true;

    if(layer->layer_blending_ranges.gray_black_src == layer->layer_blending_ranges.gray_white_src)
        gray_restricted = psd_true;

    if(gray_restricted == psd_true)
        return;

    min_src_gray = layer->layer_blending_ranges.gray_black_src >> 8;
    max_src_gray = layer->layer_blending_ranges.gray_white_src >> 8;
    min_dst_gray = layer->layer_blending_ranges.gray_black_dst >> 8;
    max_dst_gray = layer->layer_blending_ranges.gray_white_dst >> 8;

    for(i = 0; i < layer->layer_blending_ranges.number_of_blending_channels; i ++)
    {
        switch(i)
        {
            case 0:
                min_src_red = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_red = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_red = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_red = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
            case 1:
                min_src_green = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_green = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_green = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_green = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
            case 2:
                min_src_blue = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_blue = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_blue = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_blue = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
        }
    }

    width = psd_rect_width(dst_rect);
    height = psd_rect_height(dst_rect);
    opacity = layer->opacity * layer->fill_opacity / 255;
    if(layer->group_layer != NULL)
        opacity = opacity * layer->group_layer->opacity / 255;

    if(layer_mask_info->disabled == psd_false)
        default_mask_color = layer_mask_info->default_color;
    else
        default_mask_color = 255;
    mask_left = layer_mask_info->left;
    mask_right = layer_mask_info->right;
    dst_left = dst_rect->left;

    for(i = 0; i < height; i ++)
    {
        dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
            dst_rect->left;
        src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
            (dst_rect->left - layer->left);
        
        if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
            i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
        {
            mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                PSD_MAX(0, dst_rect->left - layer_mask_info->left);
        }
        else
        {
            mask_data = NULL;
        }
        
        for(j = 0; j < width; j ++, dst_data ++, src_data ++)
        {
            src_color = *src_data;
            src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);

            if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
            {
                mask_color = *mask_data;
                mask_data ++;
                switch(mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * mask_color >> 8;
                        break;
                }
            }
            else if(default_mask_color != 255)
            {
                switch(default_mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * default_mask_color >> 8;
                        break;
                }
            }
            
            switch(src_alpha)
            {
                case 0:
                    break;
                default:
                    src_alpha = src_alpha * opacity >> 8;
                    src_red = PSD_GET_RED_COMPONENT(src_color);
                    src_green = PSD_GET_GREEN_COMPONENT(src_color);
                    src_blue = PSD_GET_BLUE_COMPONENT(src_color);
                    dst_color = *dst_data;
                    dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
                    dst_red = PSD_GET_RED_COMPONENT(dst_color);
                    dst_green = PSD_GET_GREEN_COMPONENT(dst_color);
                    dst_blue = PSD_GET_BLUE_COMPONENT(dst_color);
                    
                    if(max_dst_gray - min_dst_gray != 255)
                    {
                        gray = (dst_red + dst_green + dst_blue) / 3;
                        if(gray < min_dst_gray || gray > max_dst_gray)
                            continue;
                    }
                    if(max_src_gray - min_src_gray != 255)
                    {
                        gray = (src_red + src_green + src_blue) / 3;
                        if(gray < min_src_gray || gray > max_src_gray)
                            continue;
                    }
                    
                    if(dst_red < min_dst_red || dst_red > max_dst_red ||
                        src_red < min_src_red || src_red > max_src_red)
                        continue;
                    if(dst_green < min_dst_green || dst_green > max_dst_green ||
                        src_green < min_src_green || src_green > max_src_green)
                        continue;
                    if(dst_blue < min_dst_blue || dst_blue > max_dst_blue ||
                        src_blue < min_src_blue || src_blue > max_src_blue)
                        continue;

                    if(src_alpha == 255)
                    {
                        dst_alpha = 255;
                        if(red_restricted == psd_false)
                            dst_red = src_red;
                        if(green_restricted == psd_false)
                            dst_green = src_green;
                        if(blue_restricted == psd_false)
                            dst_blue = src_blue;
                    }
                    else if(dst_alpha == 255)
                    {
                        dst_alpha = 255;
                        if(red_restricted == psd_false)
                            dst_red = ((dst_red << 8) + (PSD_GET_RED_COMPONENT(src_color) - dst_red) * src_alpha) >> 8;
                        if(green_restricted == psd_false)
                            dst_green = ((dst_green << 8) + (PSD_GET_GREEN_COMPONENT(src_color) - dst_green) * src_alpha) >> 8;
                        if(blue_restricted == psd_false)
                            dst_blue = ((dst_blue << 8) + (PSD_GET_BLUE_COMPONENT(src_color) - dst_blue) * src_alpha) >> 8;
                    }
                    else
                    {
                        flr1 = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                        flr2 = 0x100 - flr1;
                        dst_alpha = dst_alpha + ((256 - dst_alpha) * src_alpha >> 8);
                        if(red_restricted == psd_false)
                            dst_red = (dst_red * flr2 + PSD_GET_RED_COMPONENT(src_color) * flr1) >> 8;
                        if(green_restricted == psd_false)
                            dst_green = (dst_green * flr2 + PSD_GET_GREEN_COMPONENT(src_color) * flr1) >> 8;
                        if(blue_restricted == psd_false)
                            dst_blue = (dst_blue * flr2 + PSD_GET_BLUE_COMPONENT(src_color) * flr1) >> 8;
                    }
                    *dst_data = PSD_ARGB_TO_COLOR(dst_alpha, dst_red, dst_green, dst_blue);
                    break;
            }
        }
    }
}

void psd_layer_blend_restricted(psd_context * context, psd_layer_record * layer, psd_rect * dst_rect)
{
    psd_bool gray_restricted = psd_false, red_restricted = psd_false, green_restricted = psd_false, blue_restricted = psd_false;
    psd_int min_src_gray = 0, max_src_gray = 255, min_src_red = 0, max_src_red = 255, 
        min_src_green = 0, max_src_green = 255, min_src_blue = 0, max_src_blue = 255;
    psd_int min_dst_gray = 0, max_dst_gray = 255, min_dst_red = 0, max_dst_red = 255, 
        min_dst_green = 0, max_dst_green = 255, min_dst_blue = 0, max_dst_blue = 255;
    psd_argb_color * dst_data, * src_data, dst_color, src_color;
    psd_int i, j, width, height;
    psd_int opacity, mix_alpha;
    psd_int src_red, src_green, src_blue, src_alpha, 
        dst_red, dst_green, dst_blue, dst_alpha, gray;
    psd_int dst_hue, dst_saturation, dst_brightness, src_hue, src_saturation, src_brightness;
    psd_blend_mode blend_mode;
    psd_color_component * mask_data = NULL, mask_color, default_mask_color;
    psd_int mask_left, mask_right, dst_left;
    psd_layer_mask_info * layer_mask_info = &layer->layer_mask_info;
    psd_uchar * rand_data;

    for(i = 0; i < layer->number_of_channels; i ++)
    {
        if(layer->channel_info[i].restricted == psd_true)
        {
            switch(layer->channel_info[i].channel_id)
            {
                case 0:
                    red_restricted = psd_true;
                    break;
                case 1:
                    green_restricted = psd_true;
                    break;
                case 2:
                    blue_restricted = psd_true;
                    break;
            }
        }
    }
    if(red_restricted == psd_true && green_restricted == psd_true && blue_restricted == psd_true)
        gray_restricted = psd_true;

    if(layer->layer_blending_ranges.gray_black_src == layer->layer_blending_ranges.gray_white_src)
        gray_restricted = psd_true;

    if(gray_restricted == psd_true)
        return;

    min_src_gray = layer->layer_blending_ranges.gray_black_src >> 8;
    max_src_gray = layer->layer_blending_ranges.gray_white_src >> 8;
    min_dst_gray = layer->layer_blending_ranges.gray_black_dst >> 8;
    max_dst_gray = layer->layer_blending_ranges.gray_white_dst >> 8;

    for(i = 0; i < layer->layer_blending_ranges.number_of_blending_channels; i ++)
    {
        switch(i)
        {
            case 0:
                min_src_red = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_red = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_red = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_red = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
            case 1:
                min_src_green = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_green = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_green = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_green = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
            case 2:
                min_src_blue = layer->layer_blending_ranges.channel_black_src[i] >> 8;
                max_src_blue = layer->layer_blending_ranges.channel_white_src[i] >> 8;
                min_dst_blue = layer->layer_blending_ranges.channel_black_dst[i] >> 8;
                max_dst_blue = layer->layer_blending_ranges.channel_white_dst[i] >> 8;
                break;
        }
    }

    width = psd_rect_width(dst_rect);
    height = psd_rect_height(dst_rect);
    opacity = layer->opacity * layer->fill_opacity / 255;
    if(layer->group_layer != NULL)
        opacity = opacity * layer->group_layer->opacity / 255;
    if(layer->group_layer != NULL && layer->group_layer->divider_blend_mode != psd_blend_mode_pass_through)
        blend_mode = layer->group_layer->divider_blend_mode;
    else
        blend_mode = layer->blend_mode;

    if(layer_mask_info->disabled == psd_false)
        default_mask_color = layer_mask_info->default_color;
    else
        default_mask_color = 255;
    mask_left = layer_mask_info->left;
    mask_right = layer_mask_info->right;
    dst_left = dst_rect->left;

    for(i = 0; i < height; i ++)
    {
        dst_data = context->blending_image_data + (i + dst_rect->top) * context->width + 
            dst_rect->left;
        src_data = layer->image_data + (i + dst_rect->top - layer->top) * layer->width + 
            (dst_rect->left - layer->left);
        rand_data = context->rand_data + (i + dst_rect->top) * context->width + dst_rect->left;
        
        if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL &&
            i + dst_rect->top >= layer_mask_info->top && i + dst_rect->top < layer_mask_info->bottom)
        {
            mask_data = layer_mask_info->mask_data + (i + dst_rect->top - layer_mask_info->top) * layer_mask_info->width + 
                PSD_MAX(0, dst_rect->left - layer_mask_info->left);
        }
        else
        {
            mask_data = NULL;
        }

        for(j = 0; j < width; j ++, dst_data ++, src_data ++, rand_data ++)
        {
            src_color = *src_data;
            src_alpha = PSD_GET_ALPHA_COMPONENT(src_color);

            if(mask_data != NULL && j + dst_left >= mask_left && j + dst_left < mask_right)
            {
                mask_color = *mask_data;
                mask_data ++;
                switch(mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * mask_color >> 8;
                        break;
                }
            }
            else if(default_mask_color != 255)
            {
                switch(default_mask_color)
                {
                    case 0:
                        continue;
                    case 255:
                        break;
                    default:
                        src_alpha = src_alpha * default_mask_color >> 8;
                        break;
                }
            }

            switch(src_alpha)
            {
                case 0:
                    continue;
                default:
                    src_alpha = src_alpha * opacity >> 8;
                    dst_color = *dst_data;
                    dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
                    switch(dst_alpha)
                    {
                        case 0:
                            *dst_data = (src_alpha << 24) | (src_color & 0x00FFFFFF);
                            continue;
                        case 255:
                            mix_alpha = src_alpha;
                            break;
                        default:
                            mix_alpha = (src_alpha << 8) / (src_alpha + ((256 - src_alpha) * dst_alpha >> 8));
                            dst_alpha = dst_alpha + ((256 - dst_alpha) * src_alpha >> 8);
                            break;
                    }
                    break;
            }
            
            src_red = PSD_GET_RED_COMPONENT(src_color);
            src_green = PSD_GET_GREEN_COMPONENT(src_color);
            src_blue = PSD_GET_BLUE_COMPONENT(src_color);
            dst_color = *dst_data;
            dst_alpha = PSD_GET_ALPHA_COMPONENT(dst_color);
            dst_red = PSD_GET_RED_COMPONENT(dst_color);
            dst_green = PSD_GET_GREEN_COMPONENT(dst_color);
            dst_blue = PSD_GET_BLUE_COMPONENT(dst_color);
            
            if(max_dst_gray - min_dst_gray != 255)
            {
                gray = (dst_red + dst_green + dst_blue) / 3;
                if(gray < min_dst_gray || gray > max_dst_gray)
                    continue;
            }
            if(max_src_gray - min_src_gray != 255)
            {
                gray = (src_red + src_green + src_blue) / 3;
                if(gray < min_src_gray || gray > max_src_gray)
                    continue;
            }
            
            if(dst_red < min_dst_red || dst_red > max_dst_red ||
                src_red < min_src_red || src_red > max_src_red)
                continue;
            if(dst_green < min_dst_green || dst_green > max_dst_green ||
                src_green < min_src_green || src_green > max_src_green)
                continue;
            if(dst_blue < min_dst_blue || dst_blue > max_dst_blue ||
                src_blue < min_src_blue || src_blue > max_src_blue)
                continue;

            switch(blend_mode)
            {
                case psd_blend_mode_normal:
                    PSD_BLEND_NORMAL(dst_red, src_red, mix_alpha);
                    PSD_BLEND_NORMAL(dst_green, src_green, mix_alpha);
                    PSD_BLEND_NORMAL(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_dissolve:
                    switch(mix_alpha)
                    {
                        case 0:
                            break;
                        case 255:
                            *dst_data = (src_color & 0x00FFFFFF) | 0xFF000000;
                            break;
                        default:
                            if(*rand_data <= mix_alpha)
                                *dst_data = (src_color & 0x00FFFFFF) | 0xFF000000;
                            break;
                    }
                    continue;
                case psd_blend_mode_darken:
                    PSD_BLEND_DARKEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_DARKEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_DARKEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_multiply:
                    PSD_BLEND_MULTIPLY(dst_red, src_red, mix_alpha);
                    PSD_BLEND_MULTIPLY(dst_green, src_green, mix_alpha);
                    PSD_BLEND_MULTIPLY(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_color_burn:
                    PSD_BLEND_COLOR_BURN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_COLOR_BURN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_COLOR_BURN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_burn:
                    PSD_BLEND_LINEEAR_BURN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEEAR_BURN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEEAR_BURN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_lighten:
                    PSD_BLEND_LIGHTEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LIGHTEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LIGHTEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_screen:
                    PSD_BLEND_SCREEN(dst_red, src_red, mix_alpha);
                    PSD_BLEND_SCREEN(dst_green, src_green, mix_alpha);
                    PSD_BLEND_SCREEN(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_color_dodge:
                    PSD_BLEND_COLOR_DODGE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_COLOR_DODGE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_COLOR_DODGE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_dodge:
                    PSD_BLEND_LINEAR_DODGE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEAR_DODGE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEAR_DODGE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_overlay:
                    PSD_BLEND_OVERLAY(dst_red, src_red, mix_alpha);
                    PSD_BLEND_OVERLAY(dst_green, src_green, mix_alpha);
                    PSD_BLEND_OVERLAY(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_soft_light:
                    PSD_BLEND_SOFTLIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_SOFTLIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_SOFTLIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hard_light:
                    PSD_BLEND_HARDLIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_HARDLIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_HARDLIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_vivid_light:    // ?
                    PSD_BLEND_VIVID_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_VIVID_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_VIVID_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_linear_light:    // ?
                    PSD_BLEND_LINEAR_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_LINEAR_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_LINEAR_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_pin_light:
                    PSD_BLEND_PIN_LIGHT(dst_red, src_red, mix_alpha);
                    PSD_BLEND_PIN_LIGHT(dst_green, src_green, mix_alpha);
                    PSD_BLEND_PIN_LIGHT(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hard_mix:
                    PSD_BLEND_HARD_MIX(dst_red, src_red, mix_alpha);
                    PSD_BLEND_HARD_MIX(dst_green, src_green, mix_alpha);
                    PSD_BLEND_HARD_MIX(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_difference:
                    PSD_BLEND_DIFFERENCE(dst_red, src_red, mix_alpha);
                    PSD_BLEND_DIFFERENCE(dst_green, src_green, mix_alpha);
                    PSD_BLEND_DIFFERENCE(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_exclusion:
                    PSD_BLEND_EXCLUSION(dst_red, src_red, mix_alpha);
                    PSD_BLEND_EXCLUSION(dst_green, src_green, mix_alpha);
                    PSD_BLEND_EXCLUSION(dst_blue, src_blue, mix_alpha);
                    break;
                case psd_blend_mode_hue:
                case psd_blend_mode_saturation:
                case psd_blend_mode_color:
                case psd_blend_mode_luminosity:
                    psd_rgb_to_inthsb(src_red, src_green, src_blue, &src_hue, &src_saturation, &src_brightness);
                    psd_rgb_to_inthsb(dst_red, dst_green, dst_blue, &dst_hue, &dst_saturation, &dst_brightness);
                    switch(blend_mode)
                    {
                        case psd_blend_mode_hue:
                            dst_hue = src_hue;
                            break;
                        case psd_blend_mode_saturation:
                            dst_saturation = src_saturation;
                            break;
                        case psd_blend_mode_color:
                            dst_hue = src_hue;
                            dst_saturation = src_saturation;
                            break;
                        case psd_blend_mode_luminosity:
                            dst_brightness = src_brightness;
                            break;
                    }
                    psd_inthsb_to_rgb(dst_hue, dst_saturation, dst_brightness, &src_red, &src_green, &src_blue);
                    dst_red = PSD_BLEND_CHANNEL(dst_red, src_red, mix_alpha);
                    dst_green = PSD_BLEND_CHANNEL(dst_green, src_green, mix_alpha);
                    dst_blue = PSD_BLEND_CHANNEL(dst_blue, src_blue, mix_alpha);
                    break;
            }
            
            *dst_data = PSD_ARGB_TO_COLOR(dst_alpha, dst_red, dst_green, dst_blue);
        }
    }
}

#endif // ifdef PSD_SUPPORT_LAYER_BLEND


psd_status psd_image_blend(psd_context * context, psd_int left, psd_int top, psd_int width, psd_int height)
{
#ifdef PSD_SUPPORT_LAYER_BLEND
    psd_rect image_rect, layer_rect, mask_rect, rc;
    psd_int i;
    psd_layer_record * layer;
    psd_layer_mask_info * layer_mask_info;
    psd_status status;
    
    if(context == NULL)
        return psd_status_invalid_context;

    if(context->rand_data == NULL)
    {
        status = psd_build_rand_data(context);
        if(status != psd_status_done)
            return status;
    }

    psd_make_rect(&image_rect, left, top, left + width, top + height);
    psd_make_rect(&rc, 0, 0, context->width, context->height);
    if(psd_incept_rect(&image_rect, &rc, &image_rect) == psd_false)
        return psd_status_blend_empty_rect;
    
    if(context->blending_image_data == NULL)
    {
        context->blending_image_data = (psd_argb_color *)psd_malloc(context->width * context->height * 4);
        if(context->blending_image_data == NULL)
            return psd_status_malloc_failed;
        if(image_rect.left != 0 || image_rect.top != 0 || 
            image_rect.right != context->width || image_rect.bottom != context->height)
        {
            psd_color_memset(context->blending_image_data, psd_color_clear, context->width * context->height);
        }
    }

    psd_image_clear_rect(context, &image_rect);

    for(i = 0; i < context->layer_count; i ++)
    {
        layer = &context->layer_records[i];
        if(layer->visible == psd_false || layer->opacity == 0)
            continue;
        if(layer->group_layer != NULL)
        {
            if(layer->group_layer->visible == psd_false || layer->group_layer->opacity == 0)
                continue;
        }

        // if it is
        psd_adjustment_layer_blend(context, layer, &image_rect);

        // if it is
#ifdef PSD_SUPPORT_EFFECTS_BLEND
        psd_layer_effects_blend_background(context, layer, &image_rect);
#endif
        
        if(layer->image_data != NULL && layer->fill_opacity > 0 && layer->width > 0 && layer->height > 0)
        {
            psd_make_rect(&layer_rect, layer->left, layer->top, layer->right, layer->bottom);
            if(psd_incept_rect(&image_rect, &layer_rect, &layer_rect) == psd_true)
            {
                layer_mask_info = &layer->layer_mask_info;
                if(layer_mask_info->disabled == psd_false && layer_mask_info->mask_data != NULL && layer_mask_info->default_color == 0)
                {
                    psd_make_rect(&mask_rect, layer_mask_info->left, layer_mask_info->top,
                        layer_mask_info->right, layer_mask_info->bottom);
                    if(psd_incept_rect(&mask_rect, &layer_rect, &layer_rect) == psd_false)
                        continue;
                }
                
                if(psd_layer_check_restricted(context, layer) == psd_true)
                {
                    if(layer->blend_mode != psd_blend_mode_normal ||
                        (layer->group_layer != NULL && layer->group_layer->divider_blend_mode != psd_blend_mode_pass_through))
                        psd_layer_blend_restricted(context, layer, &layer_rect);
                    else
                        psd_layer_blend_normal_restricted(context, layer, &layer_rect);
                }
                else
                {
                    if(layer->blend_mode != psd_blend_mode_normal ||
                        (layer->group_layer != NULL && layer->group_layer->divider_blend_mode != psd_blend_mode_pass_through))
                        psd_layer_blend(context, layer, &layer_rect);
                    else
                        psd_layer_blend_normal(context, layer, &layer_rect);
                }
            }
        }

        // if it is
#ifdef PSD_SUPPORT_EFFECTS_BLEND
        psd_layer_effects_blend_foreground(context, layer, &image_rect);
#endif
    }

    return psd_status_done;
#else // ifdef PSD_SUPPORT_LAYER_BLEND
    return psd_status_unsupport_yet;
#endif // ifdef PSD_SUPPORT_LAYER_BLEND
}

void psd_image_blend_free(psd_context * context)
{
    psd_freeif(context->rand_data);
    psd_freeif(context->blending_image_data);
}

